VAPOR LIQUID EQUILIBRIUM MEASUREMENTS FOR BINARY-SYSTEMS OF ACETIC-ACID WITH ETHYL-ACETATE AND VINYL-ACETATE BY THE DEW BUBBLE POINT TEMPERATURE METHOD

Vapor-liquid equilibrium relations were measured for the binary systems ethyl acetate-acetic acid and vinyl acetate-acetic acid at 740 mmHg pressure by the dew-bubble point temperature method. The dew-bubble point temperature apparatus previously proposed by the authors was modified to reduce the time required for the experiment. To keep the flow rate constant, the construction of the feeder was further modified to maintain the liquid level constant in it. Vapor-liquid equilibrium relationships were obtained for the binary systems by combining the dew point temperature curve and the bubble point one. Large differences are shown among the previous experimental data in the literature for the systems of the present study. The composition analysis seems troublesome for these systems containing acetic acid in the conventional experimental methods. The present experimental method does not require any analytical instrument for the vapor-liquid equilibrium measurements. For the correlation of the experimental data, the Wilson equation was successfully applied, accounting for the association effect of acetic acid in vapor phase.